Tools, APP Software Used etc.

KiCAD

Kicad

Description

harp.device.quac (quad - DAC)

Think of it as a 4-channel, ultrasonic MP3 player.

The "Quac" board is a Digital to Analog Converter packed with features, including:

High Fidelity Digital Synthesis at 16-bit, +/-10V, and 500KHz update rate
4-output channels
play waveforms from an SD Card or from one of the built-in primitive waveform generators (sine, trapezoid/triangle)
Computer-controlled with fully worked examples in Python as a standard "Harp"-compliant device
Software or External Triggers available to trigger waveforms

This board has many use cases including:

analog galvanometer control
analog laser power modulation
ultasonic speaker waveform synthesis

Code

Firmware

https://github.com/AllenNeuralDynamics/harp.device.quac/tree/main/firmware

Schematic and Layout

Schematic / Layout

https://github.com/AllenNeuralDynamics/harp.device.quac/tree/main/hardware

CAD-Custom parts and enclosures

Enclosure CAD Model (OnShape)

https://cad.onshape.com/documents/ead77968efe820b4ecd131c1/w/59637a9e969f17bdfb8f8a49/e/516871a36164952787a658eb?renderMode=0&uiState=6a9b4d63c8796f3fb59185e1

Download BOM(Bill of materials)

Sep 22,2026

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harp.device.quac (quad - DAC)

4 Layers PCB 100 x 190 mm FR-4, 1.6 mm, 1, Immersion gold, Green Solder Mask, White silkscreen

A 4-channel, ±10V, 16-bit Digital to Analog Converter with a 500KHz update rate that plays waveforms from an SD card.

Published: Sep 22,2026

Standard PCB

BOM(Bill of materials)

Centroid file

PCBWay Donate 10% cost To Author

Only PCB

PCB+Assembly

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Project images are for reference only. Actual production is based on the manufacturing files on the project page. Please review the designer's notes (e.g., PCB thickness) and select the appropriate options. PCBWay is not responsible for issues caused by unsuitable parameter selections.
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